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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5b9b76e12a5f4ed19f6084b100bd1ad7799f31be374584ab2f0dd3be6e4ffef' 
  AND token = 'YLn9Bwmri+iGTQvR3Sue5EIR51wSOFsEy7KSFZcJvH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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