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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e3e331923fe4fa57786e0df8ada0de9c5a51173ab2fe8c408d2b245afe03b38' 
  AND token = 'mfmhXP94EVYAg0bMA7eItx0wC8ftg0MrBw59b5pNg54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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