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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64feca9ed42857fe6dde5ae00e880fb0d61d52adab341034c26b64ca08ffa1f7' 
  AND token = 'jE0q4+okZ5b+Fuj+0FU849eYYyiUlqOUA5I1LxKuc2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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