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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d07748346e05b3e49b4516a24e1387635ab8ad601b09093f8fa7abe7717ca2' 
  AND token = 'a0Jgmhn0tL3voRy4iBO/7mtvcuTg6Bo0B04bcCuKogc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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