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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4779f341e69d6c5ea9eea38091483b6aca8fe26be408ef82db7f1199ebdfc87e' 
  AND token = 'Tg/0gRZsPi3B+fXkqrRUuNSwoKPIjEsjl7K2gkzsUa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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