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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3db1e9a83dd92d728da76492fac7379f43212cf907c512f1e9d42c1a3602750' 
  AND token = 'x3v040wxzKc9J7qPxG88U8ntI8y1P/+AsJIjpFsNMqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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