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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e15edad5c2bde5e8485aac5b9e8de48395bbac5c5f425f74e460f5fc74f31d17' 
  AND token = 'vNcS4SESsnxjTqw3Im6/7Sl3/aDFX6i6u9rO3lMpw2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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