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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9230b03e2d10c500374fc3310689dd83c7adf7f7a5e323db8801084d3b1bd2b' 
  AND token = 'x0Z6gtgt2yPSExcf72z183x6twoIo/Tuhw3U31kh7hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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