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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd4796276e3a8496b69cfdb460a4576af56c7932edebe53a6de9b5b540abbb39' 
  AND token = 'VeEm+syr7zY2IMmb+tzzWu5yDWSD9n6tTFaVDY9wB18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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