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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb664075fe204a21cf6411a41a07560f4dbaddcbbdea36a9894b262fc23ed493' 
  AND token = 'ma53lN7OpzvI5zMw0H6r0itlbwZFzU6D7Ybs5igKasQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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