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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a4c5878ccfe5655c206af84b3e2be727ed9312d63e1f74af91669046a8e7ff' 
  AND token = 'Iw1dc840yOwQ0KDkoJ/ibsoKDPJDdjaTQXJXeLAS6YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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