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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bd2482f8f59ebb4f08e98a8b92abe9c555806733a0c89b14a1492e9875c8bc0' 
  AND token = '1MI1aXtgP9X8opfTrPoB1elCFgEXxC0bYFXMk7F/heg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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