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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a55618604fcdbcdb6bf8e928c60208d98add438ef5d8b9cd3ded8076c6cfdd' 
  AND token = '1cFhBJalySV/fzXEeOCTDueISzyJhNal5iWtbXAqv4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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