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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2e254297e87eb35a966d85cec8f87f8be6d823dd766ee275be2c769550cf1b1' 
  AND token = '6i8fKCXZkF15hITYFmEE43uMDFuP8xkGT2y2h/8tsfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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