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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36800962c4369b9e42ba1d159add39ed9fe58fe25be132dbc55e39beab8d82ed' 
  AND token = 'Si2pCIloQBnCN2ALB6T+WcigcsMEstub9pDi1X4Hi80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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