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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c604cf7d2ce79b37e08ceac13c76bfe47acb2d6d163e9dd2ea2a2394a18b5394' 
  AND token = 'ZiorAxW4fbWKaErGjisNJxDDrj7LvAaQ7z5f5Jp5phk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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