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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0be1719da08119ff292c3d529273018fa0ded1f212f7a03957d07cef5c881ceb' 
  AND token = 'Ch5yBD4Budre7OBBGr55Tey2CxaHOersMw/hU0GTadw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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