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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6a8d7c3242317e16f0fd320044a17a95af4450cb8ac3b640adbe2724aacf419' 
  AND token = 'R07oXfhDyznxaOs11dkIghFjsPF3NlifTiEcsJ8H5Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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