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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb3097ae5fda3e9e3db47bb9765af42001ea0004e081201c50939f7a1a89dc4a' 
  AND token = 'hSdT90MdfXeO81cO02RLVguN4K4MEJj9pqGP9olrXqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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