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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca8ced28c2e2c5b06c85630cf450607d106eb83c1fb48b4c03c89e0e85aa7067' 
  AND token = 'XtREfF4UrS3ZkhYO2mU5kgyDidQS3nDs/JBF+VEPk7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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