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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23403085bda48b1c249166205ad05df548f7aee2dc9577a261c4220fff4880fa' 
  AND token = 'wZzaE+LjXWMjZ0pmXYSAjOvJUj2t2Two/sPdN8pFSEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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