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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f26b6f28f3f377241bc57d443a5d30956591f44f35c845275e5aecc163b597ad' 
  AND token = '6qQn1ujABDq6F6HREjnfq0JveppEjEMGxopfIWITouI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}