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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c0fe6856d2d6d48334af1ae7eac7d2f62a245320f091cef7f9608646eda03f' 
  AND token = 'S5DoBVmEOdPz3daXPwpclqYSp3o9LGQ1Lnbbc+68A/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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