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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dcb3a2f78f09e1bfda76c4f1146530a2d924cb3c2a9374d7417e96bce9af6b5' 
  AND token = '1wjyh/qy2hrr4Xqt3LACMApYqPojwXyuZo2fJnSuB9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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