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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99f4f60e3464d1087240b5700a5ef72ecfd9d0461d09c998acf63a0f045d80e0' 
  AND token = 'FfWzBK0BioBxGBcWJTy3ttXcs7JxFmpw/3LsaB3r7rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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