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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04efc6097ac188ac70c69966a9f5dc919f1ebc50775d01d8244c6f5e9e1155c9' 
  AND token = 'o/N8/GOqKLtqBSglajk3qR86EExCWrjwva1mJHaUmMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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