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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6e0dd9da67d511b1dfeab83ced40156130547e16511a75f4cb9f1396ada634e' 
  AND token = 'OtKKAUAwQ2bF6+ZrtoVisWrgdKpyl9SWlibti4yLHag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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