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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2929f47639f730a85337748b75913e60cef5ea244cc35bbb2c58ece037a5a0f' 
  AND token = '9B2oay2sMDO4KyPRguIo48reYS3XCkZT15iO2UWcFLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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