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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef3013e83238f83598ace7ef7e9d2563229f9c86a594cde732aaeedc4bcc7334' 
  AND token = '0gnvQnGs2iZjIXj0MxDSkhdiIc5tzFlSNDP8Ww1B6Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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