SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7010288dba60b9a97be86fc709571271d911a9e2a4cf45958b0d4414efef5d61' 
  AND token = 'Jx35ESZqjOXR9lCTDNzfu+8ErkIvbFHJxVLcL/ymLzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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