SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc14a33173f6c1339026d09b6013542ef84134556284bfa317ef80abd814b79' 
  AND token = 'Xoh0ozn7lqZmM7RwgEqWuy4+xdl0ZFsBOzbclYTtJkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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