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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '681ec114de7770e0e5acd1fd3e27ae5e21453a09b69e73d7206ce5af6e3cdd22' 
  AND token = '90Cc+BBdkAbDHyqwN7+9H43RJOvAQzMV+YWITrhWjeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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