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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a029753fe871a47f3f2f6109e3e6e9686b2faee9920b7058cfa4a8891b35c6d' 
  AND token = 'SXdiDejUSDRQHLweXmsfEB0z6kHprCqV+DmBprCDec8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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