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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08745795d30fd368dcd480a2d2703b79948566c9763c9051b9d7b96106cac480' 
  AND token = 'dfz/ueuANnZDQmIfwnCQleHm/Wxm0WcLaMJ1YkiK880=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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