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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4723ac973e18bbbbf7188f873cefb87ab222b3ac73d95165465c7335c29fdce4' 
  AND token = 'CI/1rjFsNDK36t3fbhjA1sfYLDB6/n567pG5JPjiJGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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