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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '844fe7331834f4dae3adda3ffbfd15504d0c2dc313a230deb87dc4394e0f9b9a' 
  AND token = 'BZQp48Kizkuc2xF7h+/n+btXm1I45GHcY1ywx+guIX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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