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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0ce8fa45281dd5c1797bd171e561ecce80e1b460d550a45d25ad4da8e8ede98' 
  AND token = '9j+5wmrJmwI5GDaXgXfX1T8mwJnf4KU4brlhzjzHOC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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