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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa096cb17563774298a6ae3e7bde7dc7530dfc185f5d8c6d538de2acf59e804' 
  AND token = '79HS3y+jSaUntZUKBYfEL5mgXr5mK8kzHM90Hp19JpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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