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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9349b2d693558f87fe227d5a5348789bbea9da3e56402ac8244aea24376fea2' 
  AND token = 'Jgn/Miwc9KxVtLEClzqbVgvWMFyP6hB989N80M4bElA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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