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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07c50a41c8aedea91c5c2d6c734c71e572199363d0165d9526f96d308617b096' 
  AND token = 'n/QTckuKBDJxtMIbsVH7e+4uscqXIYsyHCwHnF53uZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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