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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab71fc9b9fd048debaf3c22b79e124fd7cfbfd1b7e89d79cd16e250f6491e7b6' 
  AND token = 'h4adydJHgyP5O/nduH32E9HGHM5+mAQw/2uFPalu6go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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