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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56ca3d8b306b9587eb6aed311137bfae107746a9e4a2050974040dca1720e000' 
  AND token = 'T2BpsISBcNjK1xy+zNul654oHkd3mZ7guR05vSDHBsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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