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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7eefa5269eb4673697b484b4d5ca9d2d207f5e23ad2f94cec49d2a881dec3ac' 
  AND token = 'ijG8JcTGMGQltv353gSHiGN1bGE2l7TgWqNJYsYcB8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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