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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee42a420f48008642d35fb1b6e28075c34458102d31e00bc5a60ae543d70fc1' 
  AND token = '8Td1IzA0JT0TbN0coW5rMxTlTfz8obRuM2zged7ywOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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