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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '904d9d3c3992ba6d3e1174e861f9fc8c692052c941cba5fa062ab29c433c6dbc' 
  AND token = 'LYR+rAfj6rpc0KBgu+7HORar/h0EVhMp8/qWTEPeJJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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