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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a213b61ab5f30bbefb25489fd63908fca452eb104446593d99a5031e30bec03d' 
  AND token = '99FOoFxdjKFwR+dStUK9c7NwRzWNnN6qGEpmaby09Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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