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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3fb19abda8e203f52c4bd4e0065169e62cbd97b7d6751508751f994d4307c98' 
  AND token = 'Sci1nJyCaxwc8WdTwB37Ob0wSCKBFspPI21wwDl7fdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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