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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '404cef9244b13873c41558dac70c36ea91d008e71a59e6ec190e380a10e27ec1' 
  AND token = '1YIVjWrFSufGQVNtO7Wf5M/Yf+J7FpDZQIc4/yAx+u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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