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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef5fe162ad700f6ec3a5e64e6969dd396dea5523ddae53b9eacb21fc59778826' 
  AND token = 'ngOjHK6kAoFqKr0Kdpe40ZORcqDxw2EuoME7P/Qeids=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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