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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3eb8dd433af917588ecc6a0c626b8174ee8b51461e9f4cc28c60fa56dfa8db6' 
  AND token = 'pvDp2olNyAzPeHn3uDL5o0pWr/vlAabu7yrLiB9BCZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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