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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928fc8f8a2ae55936b8ad6efd20312419532d89ad86f638a4e44a68d0dc9ac02' 
  AND token = 'f89cM+c9esJaIIdMejs4tQCrPKT+7Hl10z+zq2Ft9Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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