SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f6597d09b603c708632981d24890577710b8d3738f2f7102291b85c6e619123' 
  AND token = 'xCzkiaF2gV7xJ/xF7R/psrAPsC4bQ5HPSRYJtXdFz6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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