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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b5310a28d01f069c29d09faa87b7ba4f4835f1e2a5bfc7a8cb346ff482bcd8' 
  AND token = 'Pacf77QTolUucSAPKg0lXIXPrdq01/P2akknAYloJ4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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