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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f95c6a36ed60a9cec1265fb2b35b112236ca70639e75f92d589e65930ced12e' 
  AND token = 'D5xpAnAn9TeqSX6M+315jS0hpdzJ+thxLb5Y5z/fKT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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