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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99675a2af29e57594cd9e076233ec3fde1e24bcba65636b5dbc255b90829e8dc' 
  AND token = 'lvsh/boGZ/srmhInhv/5SiepLVcoZT/GT+E4vAT+1DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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