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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85551270b2038f96c318a6062f3839e2e3ffb66624d40570ed0dc1111d988a56' 
  AND token = 'BKx/6HpY5+B8FFM31Z2EqThCWa9E8HkpROrXYeNlOQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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