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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce2e013008a5efc9ae81105df5bcab2b9907a9b9f1e382db96498615fc42a2d' 
  AND token = '+2NBEr/bvvYmF4yuAif6kUerZwUzsK/BAVkNjoPt8fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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