SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c1d88374ac43cd6d1ec592217054cdc08f2b93259db7919d636d182cf83d0f7' 
  AND token = 'sWqCRA8EYH2/h0BI+Aeyp/qU6YKFN+VpPkJi6qHWZlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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