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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7a91daed11eac34be0fe99175528c88d9b918597ef49a2455fb1c4e282b8488' 
  AND token = 'PsfPWA8PBmw4Y0VRdv1a3ucTqyKj6thz0C8Jp1HR00Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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