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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d83893f66f8ad1914c4acd869a6f811c074e2380867dee6a14aa0ea8cc8a17' 
  AND token = '6+koB81eZjTqxGiSeNjgZnSrnoBgOIBnO6N1NJLCU+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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