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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4da7f60225b08f3e1c25623776c24c3b2687752f46dfae1adec5ffd7f45974' 
  AND token = 'luOo1A0PG3xGzHYbMMyJjcbMAngPWkps+Kn9eQnQrjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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