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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc89571dc72299274cb83216421f1d9b9dcee9907eef95fd2a15dc4b9b2a3455' 
  AND token = 'dvQjPvQDJliaGpG5MtFziNa0SYM6Q/PZthzw0vcGsnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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