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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '734bf0258fc277cd7aac8e9e570180bb37419a8db2419d9e6ad9f0dbfb8e56c6' 
  AND token = '9HU1uKTIeyB2NKsWp9OSeBzPxpAFXXTkkfGM6LvxKBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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