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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dc959fd3cbd40b0e88acff7a37bac46e09d2234fd08a4dfacd7d76d930f788b' 
  AND token = 'Yk1/CvO6fY6oooMekGU5lquOQOwWCY+/tjSPWl/lIlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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