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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae0d4df0f9084c7510471e49a7572e7152d97371a3ca5c30fa1fae2d5dffe025' 
  AND token = 'AorPPdniJESknCjHJ5YJi3q27HGQ6PN8jKxxz3hVvOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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