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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24631f2f72c5adb5a62f2850445ede133ec67006f23ff880200111f271da4f3f' 
  AND token = 'e88KTJ2HP/QrzOsRm7ab193Mhvl5ISr3mvTbGOZih+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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