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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d5fab5288b23dea2671f2966e49f2cf86c9160ce10be7b76f89188ebb68cc3e' 
  AND token = 'pqELz6DJgIdFfgP2KhuOksPKEfWfLJU3dOQkcELeBZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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