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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f40de3c2feecba7f4338eae4ea58a224f1fd625566b4c23e6b03972b3bbb684' 
  AND token = 'g4fiCBqmIqBqOGpHKDUocRdixvsgl1wJTsBJbtOk0B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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